taskpyFormex - Tasks: task #12366, Change the rendering engine to use...


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task #12366: Change the rendering engine to use vertex buffers and shaders

Submitted by:  Benedict Verhegghe <bverheg>
Submitted on:  Sat 22 Dec 2012 07:11:30 PM UTC  
Should Start On:  Mon 31 Dec 2012 11:00:00 PM UTC Should be Finished on:  Sun 30 Jun 2013 10:00:00 PM UTC
Category:  None Priority:  7 - High
Status:  Done Privacy:  Public
Percent Complete:  20% Assigned to:  Benedict Verhegghe <bverheg>
Open/Closed:  Closed Effort:  0.00

Mon 06 May 2013 07:54:29 AM UTC, comment #2: 

We have the basic parts of the new rendering engine working. This includes computing the matrices, use vertex buffer objects, basic shader programs, uploading of shader uniforms. The engine renders object color and vertex color modes. Element color and lighting still need to be done. Also a lot of the traditional rendering attributes of pyFormex need to be added. And any objects more complex than points, lines or triangles needs to be transformed to those.

Benedict Verhegghe <bverheg>
Project AdministratorIn charge of this item.
Sat 22 Dec 2012 08:52:57 PM UTC, comment #1: 

I created a new subdirectory 'opengl' for the development of the new rendering engine. I prefer this to using a branch, because most of the source will remain the same. I intend to create a command line option to switch to using the new model. When it is finished, we can then remove the old drawing functionality from the 'gui' directory. Having separate gui/opengl directories makes sense: opengl may be useful without gui (rendering in a buffer to create images, movies; or creating webgl output).

Benedict Verhegghe <bverheg>
Project AdministratorIn charge of this item.
Sat 22 Dec 2012 07:11:30 PM UTC, original submission:  

The current rendering engine in pyFormex uses only OpenGL v1 features. More precisely, we use display lists. While we have highly optimized this (critical functions are in the compiled C library), this technique has been deprecated by the OpenGL developers. And although compatibility layers may continue to be created in future, we are left with some inevitable shortcomings:
- new hardware (graphics cards) can not be used optimally,
- it is not compatible with OpenGL ES. This is used in embedded systems (e.g. Android, WebGL).

Therefore we aim to replace the current rendering engine with a new one, using vertex buffers and shaders. This is a major overhaul and it will therefore be done outside the main svn tree. It will become part of the main tree only after release 1.0 of pyFormex. Because we are convinced that this change is important for the future of pyFormex, this task will get high priority and we aim to finish it by mid 2013.  

Benedict Verhegghe <bverheg>
Project AdministratorIn charge of this item.


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    Follow 5 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-07-07 bverheg StatusIn Progress => Done
        Open/ClosedOpen => Closed
    2013-05-06 bverheg StatusNone => In Progress
        Percent Complete0% => 20%
        Assigned toNone => bverheg

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